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Effect of YSZ thickness on the thermal cyclic fatigue performance of gadolinium zirconate/YSZ double layered TBCs
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0003-2475-9284
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0002-9578-4076
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-7787-5444
Treibacher Industrie AG, Austria.ORCID iD: 0000-0003-0209-1332
2018 (English)In: Proceedings of the International Thermal Spray Conference, p. 79-83Article in journal (Refereed) Published
Abstract [en]

Thermal barrier coatings (TBCs) play a vital role in allowing the gas turbine engines to operate at high temperatures. With higher operating temperatures (>1200°C), the standard TBC material, 7-8wt. % Yttria Stabilized Zirconia (YSZ), is susceptible to CMAS (Calcium Magnesium Alumino Silicates) degradation and undesirable phase transformation. New TBC materials such as gadolinium zirconate (GZ) have shown to be capable of overcoming the challenges faced by YSZ. However, GZ has inferior fracture toughness relative to YSZ. In this work, three double layered TBC variations with different GZ and YSZ thickness respectively (400GZ/100YSZ, 250GZ/250YSZ and 100GZ/400GZ respectively, where the prefix numbers represent thickness in urn) were produced by suspension plasma spray (SPS) process. In all the three double layered TBC variations, the overall TBC thickness with GZ as the top layer and YSZ as the base layer was kept the same (500 urn). The objective was to investigate the influence of YSZ thickness on the thermal cyclic fatigue performance of GZ/YSZ double layered TBC. The as sprayed TBCs were characterized by SEM, XRD and porosity measurements and later subjected to thermal cyclic fatigue test at 1100°C. It was observed that the GZ/YSZ double layered TBC with lowest YSZ thickness (400GZ/100YSZ) showed higher thermal cyclic lifetime whereas the TBC with thicker YSZ layer (100GZ/400YSZ) showed lowest thermal cyclic fatigue lifetime. The failure analysis of the thermally cycled TBCs revealed similar failure modes, i.e. spallation of the top coat due to horizontal crack propagation within the thermally grown oxide (TGO). Furthermore, the ceramic top coats in all the three TBC variations after failure showed the widening of column gaps. © 2018 ASM International® All rights reserved.

Place, publisher, year, edition, pages
ASM International, 2018. p. 79-83
Keywords [en]
Failure modes; Fatigue testing; Fracture toughness; Gadolinium; Magnesium compounds; Plasma spraying; Silicates; Thermal barrier coatings; Thermal fatigue; Yttrium oxide; Zirconia, Gadolinium zirconate; Operating temperature; Porosity measurement; Suspension plasma sprays; Thermal barrier coating (TBCs); Thermal cyclic fatigue; Thermally grown oxide; Yttria-stabilized zirconias (YSZ), Yttria stabilized zirconia
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-14481Scopus ID: 2-s2.0-85068908628OAI: oai:DiVA.org:hv-14481DiVA, id: diva2:1357056
Conference
International Thermal Spray Conference, ITSC 2018; Orlando; United States; 7 May 2018 through 10 May 2018
Available from: 2019-10-02 Created: 2019-10-02 Last updated: 2019-10-28Bibliographically approved

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Mahade, SatyapalMarkocsan, NicolaieNylén, Per

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